https://bugzilla.redhat.com/show_bug.cgi?id=1163812
--- Comment #7 from Jerry C jerry@jtcloe.net --- comment 2 didn't work for me comment 5 doesn't even make sense, since the new config format is the yml format editing ejabberdctl as suggested in comment6 worked for me.
I did however lose my user database after upgrading and had to re-create all users.